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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="../css/public.css">
</head>

<body>
    <!-- strokeText  画布上绘制文本（没有填色）。文本的默认颜色是黑色 -->

    <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"></canvas>

    <script>
        var c = document.getElementById("myCanvas");
        var ctx = c.getContext("2d");
        ctx.font = "30px Arial";
        var txt = "Hello World"
        ctx.fillText("width:" + ctx.measureText(txt).width, 10, 50)
        ctx.fillText(txt, 10, 100);
    </script>
</body>

</html>